The HD25 is the natural digital hub in any audio system. It has four digital inputs and two analog outputs. The digital inputs can be used to connect a tablet, computer, streamer, Sonos, cable TV or music center to your existing audio system. And with greatly improved sound quality. The HD25 has a built in pre amplifier and a remote control which allow easy integration with active loudspeaker systems or headphone amplifiers. Should you lose your remote control, you may switch inputs by simply tapping on the front panel. If you plan to use it together with a computer as a source, the HD25 is especially clever. Out of the box it is very simple Plug & Play. Connect the USB cable and immediately enjoy high quality sound.